Sampling Bias

The set of ALL observations made on all objects under study for a given characteristic or variable.

• Sample
• Population
• Survey
• Parameter

Tags

CCSS.HSS.IC.B.3

CCSS.HSS.IC.B.4

A set of observations that constitute PART of the population.

• Statistic
• Census
• Population
• Sample

Tags

CCSS.HSS.IC.A.1

CCSS.HSS.IC.B.3

CCSS.HSS.IC.B.4

The process of gathering information/data from EACH member of the population.

• Census
• Interview
• Survey
• Questionnaire

Tags

CCSS.7.SP.A.1

CCSS.7.SP.A.2

Dylan wants to know how the students at his school rate the cafeteria.  He surveyed his school's basketball team to rate the school cafeteria. Is this a biased sample of the school's population?

• Yes, because it is a convenience survey
• No, the basketball team has the smartest students
• Yes, because it's voluntary survey
• No, he should have asked the football team

Tags

CCSS.HSS.IC.A.1

CCSS.HSS.IC.B.3

Ana wants to know the average student’s opinion of the tardy policy at her school. Which group of students should she survey in order to achieve the most accurate results?

• thirty students who are often tardy
• thirty students who are rarely tardy
• thirty of her friends
• thirty randomly selected students from her school

Tags

CCSS.HSS.IC.A.1

CCSS.HSS.IC.B.3

CCSS.HSS.IC.B.4

You want to know what is the most favorite sport of 10th graders at CHS. You ask 10th graders who want to participate to go to the office B Lunch to complete a survey. This is...

• Biased, because it is a convenience sample

• Unbiased

• Biased because it is an interval sample

• Biased because it is a volunteer sample

Tags

CCSS.HSS.IC.A.1

CCSS.HSS.IC.B.3

The population describes:

• The group of people, objects or events being surveyed
• a part of the group being surveyed
• the whole world
• the school

Tags

CCSS.7.SP.A.1

CCSS.7.SP.A.2

Identify the Population:

Shenandoah County Public Schools randomly selected 230 teachers to find out which technology resource it's teachers feel is the most effective.

• 230 Teachers

• All Shenandoah County Teachers

• Students

• Shenandoah County Public Schools

Tags

CCSS.HSS.IC.A.1

Identify the Sample:

A restaurant wants to know if their customers buy dessert when they eat out. As people leave the restaurant one evening, 20 people are surveyed at random. Eight people say they usually order dessert when they eat out. The restaurant concluded that most customers do not order dessert.

• 20 customers

• All customers

• 8 customers

• Dessert

Tags

CCSS.RI.11-12.7

CCSS.RI.8.7

CCSS.RI.9-10.7

CCSS.RL.11-12.7

CCSS.RL.9-10.7

Why do we randomly select our samples?

• to control every aspect
• reduce bias
• so we don't get the same answers from everyone
• because it is easier to do

Tags

CCSS.HSS.IC.A.1

CCSS.HSS.IC.B.3